1. From the Juravinski Cancer Centre at Hamilton Health Sciences; Department of Medicine, McMaster University; Department of Clinical Epidemiology, McMaster University; Ontario Clinical Oncology Group, Hamilton; Toronto-Sunnybrook Regional Cancer Centre; University of Toronto; Humber River Regional Hospital, Toronto, Ontario; Tom Baker Cancer Centre, Calgary; Cross Cancer Institute, Edmonton, Alberta; Nova Scotia Cancer Centre, Halifax, Nova Scotia; and McGill University, Montreal, Quebec, Canada